<template>
    <div class="app-container">
        <!-- Note that row-key is necessary to get a correct row order. -->
        <el-table ref="dragTable" v-loading="listLoading" :data="list" row-key="id" border fit highlight-current-row style="width: 100%">
            <el-table-column align="center" label="ID" width="65">
                <template slot-scope="{row}">
                    <span>{{ row.id }}</span>
                </template>
            </el-table-column>

            <el-table-column width="180px" align="center" label="Date">
                <template slot-scope="{row}">
                    <span>{{ row.timestamp | parseTime('{y}-{m}-{d} {h}:{i}') }}</span>
                </template>
            </el-table-column>

            <el-table-column min-width="300px" label="Title">
                <template slot-scope="{row}">
                    <span>{{ row.title }}</span>
                </template>
            </el-table-column>

            <el-table-column width="110px" align="center" label="Author">
                <template slot-scope="{row}">
                    <span>{{ row.author }}</span>
                </template>
            </el-table-column>

            <el-table-column width="100px" label="Importance">
                <template slot-scope="{row}">
                    <svg-icon v-for="n in + row.importance" :key="n" icon-class="star" class="icon-star" />
                </template>
            </el-table-column>

            <el-table-column align="center" label="Readings" width="95">
                <template slot-scope="{row}">
                    <span>{{ row.pageviews }}</span>
                </template>
            </el-table-column>

            <el-table-column class-name="status-col" label="Status" width="110">
                <template slot-scope="{row}">
                    <el-tag :type="row.status | statusFilter">
                        {{ row.status }}
                    </el-tag>
                </template>
            </el-table-column>

            <el-table-column align="center" label="Drag" width="80">
                <template slot-scope="{}">
                    <svg-icon class="drag-handler" icon-class="drag" />
                </template>
            </el-table-column>
        </el-table>
        <div class="show-d">
            <el-tag>The default order :</el-tag> {{ oldList }}
        </div>
        <div class="show-d">
            <el-tag>The after dragging order :</el-tag> {{ newList }}
        </div>
    </div>
</template>

<script>
import { fetchList } from "@/api/article";
import Sortable from "sortablejs";

export default {
    name: "DragTable",
    filters: {
        statusFilter(status) {
            const statusMap = {
                published: "success",
                draft: "info",
                deleted: "danger"
            };
            return statusMap[status];
        }
    },
    data() {
        return {
            list: null,
            total: null,
            listLoading: true,
            listQuery: {
                page: 1,
                limit: 10
            },
            sortable: null,
            oldList: [],
            newList: []
        };
    },
    created() {
        this.getList();
    },
    methods: {
        async getList() {
            this.listLoading = true;
            const { data } = await fetchList(this.listQuery);
            this.list = data.items;
            this.total = data.total;
            this.listLoading = false;
            this.oldList = this.list.map(v => v.id);
            this.newList = this.oldList.slice();
            this.$nextTick(() => {
                this.setSort();
            });
        },
        setSort() {
            const el = this.$refs.dragTable.$el.querySelectorAll(".el-table__body-wrapper > table > tbody")[0];
            this.sortable = Sortable.create(el, {
                ghostClass: "sortable-ghost", // Class name for the drop placeholder,
                setData: function(dataTransfer) {
                    // to avoid Firefox bug
                    // Detail see : https://github.com/RubaXa/Sortable/issues/1012
                    dataTransfer.setData("Text", "");
                },
                onEnd: evt => {
                    const targetRow = this.list.splice(evt.oldIndex, 1)[0];
                    this.list.splice(evt.newIndex, 0, targetRow);

                    // for show the changes, you can delete in you code
                    const tempIndex = this.newList.splice(evt.oldIndex, 1)[0];
                    this.newList.splice(evt.newIndex, 0, tempIndex);
                }
            });
        }
    }
};
</script>

<style>
.sortable-ghost{
  opacity: .8;
  color: #fff!important;
  background: #42b983!important;
}
</style>

<style scoped>
.icon-star{
  margin-right:2px;
}
.drag-handler{
  width: 20px;
  height: 20px;
  cursor: pointer;
}
.show-d{
  margin-top: 15px;
}
</style>
